<template>
  <div class="appBox">
    <router-view></router-view>
  </div>
</template>

<script>
export default {
  name: "App",
  created() {
    //在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem("store")) {
      this.$store.replaceState(JSON.parse(sessionStorage.getItem("store")));
    }
    //在页面刷新时将vuex里的信息保存到sessionStorage里
    window.addEventListener("beforeunload", () => {
      sessionStorage.setItem("store", JSON.stringify(this.$store.state));
    });
  },
};
</script>

<style scoped>
.appBox {
  height: 100%;
}
</style>